Read the following information and answer the questions given below:
i. A finance companys office has 3 windows W1, W2 and W3 for handling various transactions.
ii. W1 is open the between 10 a.m. and 2 p.m. on Monday, Wednesday and Thursday and between 2.30 p.m. and 4.30 p.m. on Tuesday, Friday and Saturday.
iii. W2 is open between 9 a.m. and 12 noon on Tuesday, Thursday and Friday and between 1 p.m. and 3 p.m. on Monday, Wednesday and Saturday.
iv. W3 is open between 8 a.m. and 11 a.m. on Monday, Tuesday and Thursday and 12 noon and 12 p.m. on Wednesday, Friday and Saturday.
On which day, more than one windows are not open simultaneously at any given time?